Two-Dimensional Mesoporous Cobalt Sulfide Nanosheets
as a Superior Anode for a Li-Ion Battery and a Bifunctional Electrocatalyst
for the Li–O<sub>2</sub> SystemPalanichamy SennuMaria ChristyVanchiappan AravindanYoung-Gi LeeKee Suk NahmYun-Sung Lee10.1021/acs.chemmater.5b02364.s001https://acs.figshare.com/articles/Two_Dimensional_Mesoporous_Cobalt_Sulfide_Nanosheets_as_a_Superior_Anode_for_a_Li_Ion_Battery_and_a_Bifunctional_Electrocatalyst_for_the_Li_O_sub_2_sub_System/2137912We
report the synthesis of two-dimensional (2D) Co<sub>3</sub>S<sub>4</sub> in a nanothickness sheetlike morphology via simple hydrothermal
process and its application to electrochemical energy-storage devices.
The presence of unique mesopores
with a combination of core/shell nanoparticles in the nanosheets showed
superior electrochemical performances as a negative electrode for
a Li-ion battery (LIB) and an electrocatalyst in Li–O<sub>2</sub> battery applications. A high discharge capacity of ∼968
mAh g<sup>–1</sup> is noted after 60 cycles with excellent
cycling stability
when evaluated as an anode for a LIB. On the other hand, the first
discharge capacity of ∼5917 mAh g<sup>–1</sup> is observed
with a high reversibility of 95.72% for the Li–O<sub>2</sub> battery point of view. This exceptional electrochemical
performance in both applications is mainly attributed to the presence
of mesoporous with core/shell 2D nanostructure, which translates more
catalytic bifunctional (oxygen reduction reaction/oxygen evolution
reaction) active sites
for Li–O<sub>2</sub> and sustains the volume variations that
occur in a three-dimensional
manner upon the charge–discharge process for LIB applications. <i>Ex situ</i> studies, such as transmission electron microscopy,
X-ray photoelectron spectroscopy, and impedance spectroscopy studies,
are also conducted to validate the reaction mechanisms.2015-08-25 00:00:00LIBnanothickness sheetlike morphologypresencetransmission electron microscopycore3Simpedance spectroscopy studiesmAhdischarge capacityLielectrochemicalapplicationperformance